Production of beta '-SiAlONs through carbon/oxide nanocomposites obtained from montmorillonite/aromatic-ammonium complexes

Carbon/oxide nanocomposites were formed by thermal treatment of montmorillonite/ammonium complexes, in the range 500-1000 deg C. Although montmorillonite is decomposed > 700 deg C, the lamellar structure is maintained up to 1000 deg C by the presence of intercalated carbon. The amount of C in the...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 1992-11, Vol.A168 (2), p.239-243
Main Authors: Seron, A, Maimoun, I B, Crespin, M, Beguin, F
Format: Article
Language:English
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Summary:Carbon/oxide nanocomposites were formed by thermal treatment of montmorillonite/ammonium complexes, in the range 500-1000 deg C. Although montmorillonite is decomposed > 700 deg C, the lamellar structure is maintained up to 1000 deg C by the presence of intercalated carbon. The amount of C in the composites can be adjusted by varying the nature of the organic ammonium cations so as to reach the computed value given by the theoretical equation for the formation of beta '-SiAlON (19%). Starting from the montmorillonite/safraninium complex, the C content in the nanocomposite was 17.3% beta '-SiAlON was synthesized by heat treatment of this composite to 1350 deg C under N. Since the oxide and the C source are intimately mixed on the nanoscale, beta '-SiAlON is even obtained at temperatures as low as 1100 deg C. Compared with other processes, the temperature for beta '-SiAlON formation can be lower by approx300 deg C.
ISSN:0921-5093